Rick Grimes, a former police officer, leads the group of Atlanta survivors in their desperate search for a safe haven from the constant dangers that now lurk amongst them. After the horde of walkers laid waste to Hershel's farm, Season 3 finds the survivors now seeking refuge in a nearby prison. As they look to rebuild their lives, it becomes apparent that there is more than just the undead to worry about in this post-apocalyptic world.